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This means it's not possible to cheat creatures into play out of nowhere (which madness can do), but it also means you're granted more flexibility, because you can cast a spell for its mayhem cost at any point during the turn in which it was discarded (rather than having to choose immediately as per madness rules)
Creatures you control can't attack
These cards are 25+ years old, and the vast majority of surviving copies show play wear whitened corners, surface scratches, edge nicks, and holo surface damage from being carried in pockets, traded on school playgrounds, and stored in shoeboxes